Self-adjusting oil-pump.



E. J. LEBS SELF ADJUSTING OIL PUMP.

APPLIOATION FILED JAN. 24, 1908.

@1 ?AL-@@ 0 Patented Apr. 6, 1909.

2 SHEETS-SHEET 1.

SWW

Hi9 Aim E. J. LEES.

SELF ADJUSTING OIL PUMP.

APPLIOATION FILED JAN.24, 1908.

917,66 Patented Apr. 6, 1909.

2 SHEETS-SHEET 2.

unrrnn srarns arena FEM,

ERNEST J. LEES, OF CLEVELAND, OHIO, ASSIGNOR TO THE GRANT- 1 E3 5,CQMiPANY, QB QLEVE- LAND, OHIO, A CORPORATION OF OHIO.

sntnanrusrrne GEL-PUMP.

To all whom it may concern:

Be it known that I, ERNEST J. LEES, a'citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Self-AdjustingOil-Pumps, of which the following is a full, clear, and eX- actdescription.

The object of the present invention is to provide an improved oil pumpof simple construction, capable of a longer term of service than thatpossessed by pumps, of the same general type, heretofore.

More particularly, my invention is directed to the class of pumps inwhich a air of meshing gears are used to force the uid from one side ofthe casing to the outlet at another side thereof, and to rovide meanswhereby the gear, which is tted to the receiving cavity, mayautomatically take up such wear as may occur between its outer peripheryand the wall with which such periphery contacts in making an efiectivefit.

R eferring to the accompanying drawings, which illustrate an embodimentof my invention, l'igure 1 is an elevation of the pump with its frontplate removed, the driving shaft, and securing screws bein shown incross section. hig. 2 is a vertica section on the line 2-2 of Fig. 1.Fig. 3 is a detail perspective view of the end of the driving shaft. ligs. 4 and 5 are respectively a section and side elevation, each partlybroken away, illustrating the application of means for drawing the idleraway from either side.

The casing body A is provided with a suitable inlet orifice A and anoutlet orifice A on different sides thereof, and is supported by meansof a suitable adjustable foot- A At one side of the casing is provided areceiving cavity A of proper diameter, and communieating with thiscavity is what mi ht be called the discharge cavity A, whjc iis incommunication with the outlet A In the cavity A is fitted a driven gearBhaving mesh with an idler gear 0, which latter is of proper diameter torotate within the discharge cavity A. I prefer that the discharge cavityshall be of such diameter and its sides of such curvature that the idlergear may find a bearing wall at either side leaving a proper dischargeprssage.

The side of the casing against which the idler gear will ri e will, ofcourse, depend Patented a hi 6, race.

upon the direction of rotation of the driven gear fitted in thereceiving cavity. 1 provide a front plate D for the casin secured in anypro er manner thereto, 9,11% having .a bearing in which is journaled adriv ng shaft E. This shaft at-its inner end ta lies within a centralopening of the driven gear B, in suchmanner as to transmit its rotarymotion to said gear. liquid is fed to the receivin ear B rotated bymeans 0% the shaft E, as, for example,- from right to left in ii 1, the

When oil or other cavity, and the gear C will lie against the left handsi e of the u casing and fit the curve of the left hand wall thereof.

Assuming the gear B to fit its cavity snugly, it will be obvious thatthe oil fed in the receiving opening A will be caught by the gear teethand carried up the right hand side of the cavity as the therealong, theoil being de ivered into the discharge cavity A The idler ear C, lyingagainst the left hand wall of t e discharge cavity and meshin with thegear B, will prevent any of the oi? from passing down again onto theleft hand side of the cavity A, and thus the liquid will be forcedthrough the pump. In the event that the driven gear should rotate in theopposite direction, the idler gear C would, of course, lie against theright handwall of the cavity A, and the same forcing action would takeplace, exce t that the oil would pass up the left hand si e of the gearB instead of at the right hand side thereof. So long as the gear B fitssnugly against the wall, along which the teeth take their downwardmovement toward the inlet opening A, the pump will work well, but, whenthe fit at this point is no longer good, the forcing action of the pumpis diminished, and its utility, as a pump, ceases. -Heretofore thedriven gears in such pumps have been rigidly fixed to the driving shaft,and, consequently, retain their original position throughout their use,remaining concentric with the shaft. Thus, when wear takes place betweenthe periphery of the gear and the walls of the receiving cavity, itwould be either necessary to permanently shift the shaft in itsbearings, which would be an impractical proposition, or to give up thepump. 1 have provided a construction, however, which obviates thesedifficulties and which permits of the gear B being automatically earteeth pass fitted to its coacting cavity wall throughout its period ofuse.

As shown in Fig. 3, the shaft E is provided with suitable wings Eprojecting therefrom, and, in the instance shown, at 90 from each other.This is the preferable form, though, obviously, it is not the only formcapable of use. There is an opening B in the central portion of the gearB corresponding in con tour with the end of the s aft E, and its wingsE, which opening'is,'however, larger than the-shaft end. In actualpractice, I prefer to provide a clearance of one-eighth of an inchbetween'the shaft end and the sides of the opening in which it isplaced. Obviously, upon rotating the shaft E, the wings E will rotatethe gear by bearing against the walls, to which the wings are proximate,on the side toward which they are moving. So long as the gear fitssnugly in its cavity with out wear, it will be properly driven and itsaction will be the same as if it were centered and permanently fixed toashaft. When, however, the cavity becomes enlarged by the wearing of thegear teeth against the side walls, the connection which I have shownwill permit the gearto be thrown toward thatside in which the directionof rotation takes place. The amount of play which I-generally allow inthe driving connection,it being, as stated above, approximatelyoneeighth of an inch,is amply sufficient to take care of such wear as isapt to occur. By this means I have made my pumps last much longer thanhitherto known in the art, and am sure that they may be relied upon atall times, it not being possible that a pump could ordinarily begin toleak within a short time after being started inuse.

The pump described is,.obviously, simple in construction and efficientinoperation, and possesses many advantages in addition to those abovepointed out, which will be plain to those skilled in the art.

As shown in Figs. 4 and 5 Inlay employ a reciprocatable plunger F with acone s aped end F thereon for drawing the idler gear C away from eitherside when a cessat onof operation is desired. This plunger isnornaallyretracted away from the idler back into its casing F, but the idler hasa central bore of sufiicient diameter at its mouth for the tip end F ofplunger cone to pass within the same in allpositions of the idler. Bymerely pushing in the plunger the conewill cause'the idler to move awayfrom the side against which it may be lying and draw-it over to thecenter where it will be held in idle rotation without operative efiectas a pump. Having described my invention, I claim: 1. A'pumpcomprising acasing and having an inlet, an outlet, a receiving cavity,

and a discharge cavity, two meshing gears in said casing, one of saidgears being in the receiving cavity, the. other being in the dischargeand of less diameter than the cavity and sup lemental means for movingit away from eit er side wall of the cavity.

2. Apump comprising a casing and having an inlet, an outlet, a receivingcavity, and a discharge cavity, ,two meshing gears in said casing, oneof said gears being in the receiving cavity, the other being inthe-dischargeand of less diameter than the cavity and supplemental meansfor moving it away from either side wall of the cavity, and hold.-

inglilt so moved.

. testimony whereof, I hereunto aflix my.

signature in the presence of two witnesses.

. ERNEST J. LEES.

Witnesses:

E.'B. GILCHRIST, H. R. SULLWAN.

